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Samebug tips

A few things cause this exception:
1) Check if you have all jars and if they're in the correct path.
2) Your classpath might be broken, you can define it in the command line with java -cp yourClassPath or at your IDE if you're using one.

java.lang.ClassNotFoundException: org.mortbay.jetty.servlet.ServletHandler at java.lang.ClassLoader.findClass(ClassLoader.java:531) at java.lang.ClassLoader.loadClass(ClassLoader.java:425) at java.lang.ClassLoader.loadClass(ClassLoader.java:358) at org.eclipse.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:407) at org.eclipse.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:383) at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:800) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) at java.net.URLClassLoader.defineClass(URLClassLoader.java:449) at java.net.URLClassLoader.access$100(URLClassLoader.java:71) at java.net.URLClassLoader$1.run(URLClassLoader.java:361) at java.net.URLClassLoader$1.run(URLClassLoader.java:355) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:354) at com.google.gwt.dev.shell.jetty.JettyLauncher$WebAppContextWithReload$WebAppClassLoaderExtension.findClass(JettyLauncher.java:413) at org.eclipse.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:421) at org.eclipse.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:383) at org.jboss.weld.environment.gwtdev.GwtDevHostedModeContainer.getWeldServletHandlerClass(GwtDevHostedModeContainer.java:46) at org.jboss.weld.environment.gwtdev.GwtDevHostedModeContainer.initialize(GwtDevHostedModeContainer.java:57) at org.jboss.weld.environment.servlet.Listener.contextInitialized(Listener.java:150) at org.eclipse.jetty.server.handler.ContextHandler.callContextInitialized(ContextHandler.java:782) at org.eclipse.jetty.servlet.ServletContextHandler.callContextInitialized(ServletContextHandler.java:424) at org.eclipse.jetty.server.handler.ContextHandler.startContext(ContextHandler.java:774) at org.eclipse.jetty.servlet.ServletContextHandler.startContext(ServletContextHandler.java:249) at org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1242) at org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:717) at org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:494) at com.google.gwt.dev.shell.jetty.JettyLauncher$WebAppContextWithReload.doStart(JettyLauncher.java:518) at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:64) at org.eclipse.jetty.server.handler.HandlerWrapper.doStart(HandlerWrapper.java:95) at org.eclipse.jetty.server.handler.RequestLogHandler.doStart(RequestLogHandler.java:162) at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:64) at org.eclipse.jetty.server.handler.HandlerWrapper.doStart(HandlerWrapper.java:95) at org.eclipse.jetty.server.Server.doStart(Server.java:282) at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:64) at com.google.gwt.dev.shell.jetty.JettyLauncher.start(JettyLauncher.java:717) at com.google.gwt.dev.DevMode.doStartUpServer(DevMode.java:522) at com.google.gwt.dev.DevModeBase.startUp(DevModeBase.java:1104) at com.google.gwt.dev.DevModeBase.run(DevModeBase.java:844) at com.google.gwt.dev.DevMode.main(DevMode.java:322)